Water-tube boiler.



lA. W. OFELDT.

WATER TUBE BOILEEf APPLICATION FILED umso, 1913.

Patented July 21, 1914.

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AUGUST WQOFELDT, OF JERSEY CITY, NEW JERSEY.

WATER-TUBE norman.

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To all whom t may concern:

Be it known that ll, AUGUST W. rnLDfr, a citizen of the United States ofAmerica, and a resident of Jersey City, county of Hudson,

tate of New Jersey, have invented a certain new and useful VVater-'lubeBoiler, of which the following is a specification.

My invention relgates to improvements in water tube boilers, andparticularly to means for insuring cleaning of the generating tubesduring blowing oil of the boiler.

My invention consists in means for forcing the steam to pass through thegenerating tubes during the blowing ed of the boiler, which means,however, does *not interfere with normal water circulation during normaloperation of the boiler.

The object of my invention is to insure cleaning of the generating tubesof steam boilers, particularl coiled generating tubes, during blowingofi of the boiler.

l will now proceed to describe my invention with reference to theaccompanying drawings and will thenjpoint out the novel features inclaims. y I y ln said drawings: Figure 1 shows a cenu tra] verticalsection of a boiler embodying my invention lFig. 2 a horizontal sectionof the boiler; and Fig. 3 a detail vertical section of one of the floatvalves.

ln the drawings 1 designates the outer shell of the boiler and 2 aninner shell, the space within this inner shell constituting the fuelandcombustion space. I customarilyr close the annular space between theinner and 'outer shells of the' boiler by rings 3 and 4 welded to theinner and outer shells.

5 designates the fire door opening, G the fire door and 7 the frame ofthe fire door opening, which frame is also, customarily, welded to' theouter and inner shells 1 and 2.

8, 8 designate generating tubes which, in the construction shown, arepipe coils, connected atv the ends vto the annular space between theouter andinner shells 1 and 2. In practice, the ends of these pipe.coils 8 are welded into suitable openings in the inner shell 2. l

9 designates the steam discharge connection, and 10 the blow olliConnection, thelatf -ter being provided, as is customary, witha valve11.

'lhe space between the outer and inner'- 'shells '1 and 2 constitutesthe water and Specification of Letters Patent.

Application filed October 30, 1913.

Patenten .tary ai, i alla. serial no. 798,362,

4steam space of the boiler, the water level v.being carried, usually, toa point near the upper ends of the pipe coils t will readily be seenthat if (except for the means hereinafter described) the water boilerwere to be drawn off by opening the blow off valve 11, steam would notbe forced through the coils 8 to any material extent, and therefore,though water in those coils might be drawn oil", sediment and scaledeposited within such coils would not necessarily be carried away. Toinsure the carry- 4ing oli of sediment and scale deposited within thepipe coils 8, ll divide the annular steam and water space between. the

outer and inner shells 1 and 2, by a ring 12,

preferably welded to the inner and outer in the shells 2 and l,V andprovided with valve openings 13 adapted to be closed by valve plugs 14Cprovided with doats 15. The ring i 12 is located between the upper andlower ends of the pipe coils 8. lVhen the boiler is l' filled with waterto a point above' the floats- 15 these floats will hold the valves 14open, yBut when the boiler is blown ofi' by opening the valve 1l., whilethe boiler is under steam pressure, as the water level falls the valves14 will close, forcing the steam liberated from the water above thesevalves to passthrough the coils 8 into the space below the ring l2,thereby` thoroughly scouring the interior of these coils 8 and therebyfreeing these coils from deposited sediment and scale. y

Heretofore much difficulty has been eX- perienced in the cleaning of thegenerating tubes of water tube boilers, particularly when such tubes areof curved form, and still more particularly when such tubes are coiled.rlhe present invention overcomes this difliculty, the mere opening ofthe blow off valve 11, while the boiler is under steam pressure, causingthe steam to pass through the coils and thereby to thoroughly scour t esame. v

The boiler herein illustrated and descri-bed is articularly intended foruse in Ahouse heating systems, and is not intended lto b'e'operatedunder great pressure. However, ll do not restrict my invention to lowypressure bellers, as theinvention is equally applicable to boilerslntended to operate under high pressure; and my invention is alsoindependent of the particular character ot' fuel to be used in theboiler,j,. et., whether the fuel to be used be solid, liquid, or gas.

Ylil'hatlclaimisz l. ln a boiler, the combination with va structurecomprising a steam 4and 'water space, having a valved blow odconnection, a heating space, and generating tubes in that kheating spaceeach connected at both ends` to said steam and water space, of a portedpartition located in such steam and water space between the ends 'ofsuch generati-ng tubes, and dividing such steam and water space intoseparate chambers, and valve means controlling liow through the port orlports of such partition and normally open but adapted to close such portor ports when the blowV ottx connection is opened.

2. Ina boiler, the combination with a structure comprising a steam andwater space, having a valved blow on connection,v

' a heating space, andl generating. tubes in l.space at different.levels, of aA ported partif tion located in-v such vsteam and waterspace that heating spaceeach having its ends'con nected to said steamand water space at dit- `ferent levels, ot' a ported partition locatedvin such steam and water space between the ends or such generating tubes,and dividing such steam -and iwater space into separate chambers, andvalve means controlling iow through the port or ports of such .artitionand normally open but adapted'to c ose such port or ports tvhenthe blowoff .connection is opened. i i v 3. ln' ai boiler, the combination,.vithV a structure` comprising a vertical annular steam and water spacehaving a ivalved blow ott connection, a 'heating pipe within-suchannular steam and water space, and generating tubes in 'that 'heatingspace each having its ends connected to. said steam and water betweenthe ends of such generating'tubes,

and dividing such steam'and water space into*l separate chambers, Vandvalve means controlling ow through the verating tubes',

port or ports of such partition and normally ed to close -sucl port or.ports when the blow off connection is opened. l.

4. lnV a boiler, the coi'nbinationI with a structure comprising a steamand` water open but adapt- .i

space, having a valved blow off connection,

a heating space, and generating tubes in that heating space eachconnected at both-ends to said steam and water space, of a portedparti-A tion located in such steam and water space ybetween the ends ofsuch generating tubes, and dividing such steam and water space A intoseparate chambers, and 'one or more float-operated valves controlling.How through the port or ports of such partition and normally open butada ted to close such port or ports when the low 'olf connection isopened. f Y* 5. ln afboiler, the combination with a structure comprisinga steam and vwater space, having a valved blow on connection,

a heating space, and generating tubes in f.

connected 4at .both

that heating space each .of a

ends to said steam and water-space,

'ported partition located insuch steam and between the ends of suchgenand dividingsuch steam and water space into .separate chambers, andone or more float-valves controlling flow through the port or ports ofsuch partition and normally openbut adaptedto close such port waterspace .or `ports when the blowy off connection is opened, each suchfloat valve comprising a valve plug above the partition, a Stem passingthrough the corresponding portfof that partition, and a ,float beneathsuch`partition and connected to suchf stein. ln testimony whereof lfhavesigned this lspecification in the presenceo two subscribing witnesses. lU i v A Y AUGUST-YW "OFELDT, Witnessesz 'H M. Mmm, =i

I Rim. H. 4

